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<pre><span class="comment"> /****************************************************************************
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 #include &lt;QtGui&gt;

 #include &quot;mainwindow.h&quot;
 #include &quot;previewform.h&quot;

 MainWindow::MainWindow()
 {
     textEdit = new QTextEdit;
     textEdit-&gt;setLineWrapMode(QTextEdit::NoWrap);
     setCentralWidget(textEdit);

     findCodecs();

     previewForm = new PreviewForm(this);
     previewForm-&gt;setCodecList(codecs);

     createActions();
     createMenus();

     setWindowTitle(tr(&quot;Codecs&quot;));
     resize(500, 400);
 }

 void MainWindow::open()
 {
     QString fileName = QFileDialog::getOpenFileName(this);
     if (!fileName.isEmpty()) {
         QFile file(fileName);
         if (!file.open(QFile::ReadOnly | QFile::Text)) {
             QMessageBox::warning(this, tr(&quot;Codecs&quot;),
                                  tr(&quot;Cannot read file %1:\n%2&quot;)
                                  .arg(fileName)
                                  .arg(file.errorString()));
             return;
         }

         QByteArray data = file.readAll();

         previewForm-&gt;setEncodedData(data);
         if (previewForm-&gt;exec())
             textEdit-&gt;setPlainText(previewForm-&gt;decodedString());
     }
 }

 void MainWindow::save()
 {
     QString fileName = QFileDialog::getSaveFileName(this);
     if (!fileName.isEmpty()) {
         QFile file(fileName);
         if (!file.open(QFile::WriteOnly | QFile::Text)) {
             QMessageBox::warning(this, tr(&quot;Codecs&quot;),
                                  tr(&quot;Cannot write file %1:\n%2&quot;)
                                  .arg(fileName)
                                  .arg(file.errorString()));
             return;
         }

         QAction *action = qobject_cast&lt;QAction *&gt;(sender());
         QByteArray codecName = action-&gt;data().toByteArray();

         QTextStream out(&amp;file);
         out.setCodec(codecName);
         out &lt;&lt; textEdit-&gt;toPlainText();
     }
 }

 void MainWindow::about()
 {
     QMessageBox::about(this, tr(&quot;About Codecs&quot;),
             tr(&quot;The &lt;b&gt;Codecs&lt;/b&gt; example demonstrates how to read and write &quot;
                &quot;files using various encodings.&quot;));
 }

 void MainWindow::aboutToShowSaveAsMenu()
 {
     QString currentText = textEdit-&gt;toPlainText();

     foreach (QAction *action, saveAsActs) {
         QByteArray codecName = action-&gt;data().toByteArray();
         QTextCodec *codec = QTextCodec::codecForName(codecName);
         action-&gt;setVisible(codec &amp;&amp; codec-&gt;canEncode(currentText));
     }
 }

 void MainWindow::findCodecs()
 {
     QMap&lt;QString, QTextCodec *&gt; codecMap;
     QRegExp iso8859RegExp(&quot;ISO[- ]8859-([0-9]+).*&quot;);

     foreach (int mib, QTextCodec::availableMibs()) {
         QTextCodec *codec = QTextCodec::codecForMib(mib);

         QString sortKey = codec-&gt;name().toUpper();
         int rank;

         if (sortKey.startsWith(&quot;UTF-8&quot;)) {
             rank = 1;
         } else if (sortKey.startsWith(&quot;UTF-16&quot;)) {
             rank = 2;
         } else if (iso8859RegExp.exactMatch(sortKey)) {
             if (iso8859RegExp.cap(1).size() == 1)
                 rank = 3;
             else
                 rank = 4;
         } else {
             rank = 5;
         }
         sortKey.prepend(QChar('0' + rank));

         codecMap.insert(sortKey, codec);
     }
     codecs = codecMap.values();
 }

 void MainWindow::createActions()
 {
     openAct = new QAction(tr(&quot;&amp;Open...&quot;), this);
     openAct-&gt;setShortcut(tr(&quot;Ctrl+O&quot;));
     connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

     foreach (QTextCodec *codec, codecs) {
         QString text = tr(&quot;%1...&quot;).arg(QString(codec-&gt;name()));

         QAction *action = new QAction(text, this);
         action-&gt;setData(codec-&gt;name());
         connect(action, SIGNAL(triggered()), this, SLOT(save()));
         saveAsActs.append(action);
     }

     exitAct = new QAction(tr(&quot;E&amp;xit&quot;), this);
     exitAct-&gt;setShortcut(tr(&quot;Ctrl+Q&quot;));
     connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

     aboutAct = new QAction(tr(&quot;&amp;About&quot;), this);
     connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

     aboutQtAct = new QAction(tr(&quot;About &amp;Qt&quot;), this);
     connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
 }

 void MainWindow::createMenus()
 {
     saveAsMenu = new QMenu(tr(&quot;&amp;Save As&quot;), this);
     foreach (QAction *action, saveAsActs)
         saveAsMenu-&gt;addAction(action);
     connect(saveAsMenu, SIGNAL(aboutToShow()),
             this, SLOT(aboutToShowSaveAsMenu()));

     fileMenu = new QMenu(tr(&quot;&amp;File&quot;), this);
     fileMenu-&gt;addAction(openAct);
     fileMenu-&gt;addMenu(saveAsMenu);
     fileMenu-&gt;addSeparator();
     fileMenu-&gt;addAction(exitAct);

     helpMenu = new QMenu(tr(&quot;&amp;Help&quot;), this);
     helpMenu-&gt;addAction(aboutAct);
     helpMenu-&gt;addAction(aboutQtAct);

     menuBar()-&gt;addMenu(fileMenu);
     menuBar()-&gt;addSeparator();
     menuBar()-&gt;addMenu(helpMenu);
 }</pre>
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